[Hamulus fracture: a frequently unrecognized injury. Presentation of diagnosis and therapy based on two case reports].

Fractures of the hook of the hamate are rare injuries of the hand. They are caused by direct trauma to the palm, however there are some cases without history of trauma. While physical examination is often suspicious of fracture, standard X-ray films can fail to demonstrate the fracture. Bone scans show an increased uptake in the ulnar region of the wrist. The carpal tunnel view or computed tomography confirm the diagnosis. Operative treatment is recommended. Simple excision of the hook, bone grafting or internal fixation are possible procedures. The diagnostic problems are demonstrated in two case reports.